﻿// The MIT License(MIT)
//
// Copyright(c) 2021 Alberto Rodriguez Orozco & LiveCharts Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#if ANDROID

// reachable on maui android or uno android (without skia renderer)

using System;
using LiveChartsCore.Motion;

namespace LiveChartsCore.Native;

internal partial class NativeFrameTicker : IFrameTicker
{
    private IRenderMode _renderMode = null!;
    private CoreMotionCanvas _canvas = null!;
    private VSyncTicker _vsyncTicker = null!;

    public void InitializeTicker(CoreMotionCanvas canvas, IRenderMode renderMode)
    {
        _canvas = canvas;
        _renderMode = renderMode;
        _vsyncTicker = new VSyncTicker(OnFrameTick);
        _vsyncTicker.Start();

        _canvas.Invalidated += OnCoreInvalidated;

        CoreMotionCanvas.s_tickerName = "Choreographer Android";
    }

    private void OnCoreInvalidated(CoreMotionCanvas obj) =>
        _renderMode.InvalidateRenderer();

    private void OnFrameTick()
    {
        if (_canvas.IsValid) return;
        _renderMode.InvalidateRenderer();
    }

    public void DisposeTicker()
    {
        _canvas.Invalidated -= OnCoreInvalidated;

        _canvas = null!;
        _renderMode = null!;
        _vsyncTicker.Stop();
        _vsyncTicker = null!;
    }

    private class VSyncTicker(Action onFrameTick)
        : Java.Lang.Object, Android.Views.Choreographer.IFrameCallback
    {
        private readonly Android.Views.Choreographer _chor = Android.Views.Choreographer.Instance!;

        public void Start() =>
            _chor.PostFrameCallback(this);

        // frameTimeNanos:
        // the absolute timestamp (in nanoseconds) that the system’s choreographer assigns to this frame.
        public void DoFrame(long frameTimeNanos)
        {
            onFrameTick();
            _chor.PostFrameCallback(this);
        }

        public void Stop() =>
            _chor.RemoveFrameCallback(this);
    }
}

#endif
